COUNTY WATER-SYSTEM LEDGER
Columbia, Oregon
EPA’s September 2026 export lists 3 active community water systems serving Columbia, Oregon, with 0 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Columbia, Oregon
EPA associates 3 covered systems with Columbia, Oregon; their reported population-served values total 24,620 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| St Helens, City OfOR4100724 | 13,410 | Groundwater under influence of surface water | No current violation flagged |
| Scappoose, City OfOR4100792 | 8,710 | Surface water | No current violation flagged |
| Mcnulty Water PudOR4100725 | 2,500 | Ground water | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Columbia, Oregon
EPA classifies 3 systems serving Columbia, Oregon across 3 primary-source categories; Groundwater under influence of surface water is the largest category with 1 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.